Method for shaping indented steel wire and apparatus therefor

ABSTRACT

This invention relates to a method for shaping an indented steel wire characterized by comprising the steps of causing a coil shaped steel wire material to pass between working rolls consisting of a plurality of work rolls having convex portions immediately before applying said steel wire to a straightening machine to form it into a rectilinear shape thereby to shape a strip or several strips of rectilinear indentation around the outer periphery of the steel wire; then causing said steel wire to pass through a straightening machine thereby to automatically form one strip or several strips of spiral indentations; and cutting said wire material into a predetermined dimension by means of a cutter; and further to a device therefor.

United States Patent 11 1 Fukushima et al.

1451 July 3, 1973 METHOD FOR SHAPING INDENTED STEEL WIRE AND APPARATUS THEREFOR [73] Assignee: Nippon Concrete Industries Co.,

Ltd., Minato-ku, Tokyo, Japan [22] Filed: Nov. 30, 1971 [21] Appl. No.: 203,171

FOREIGN PATENTS OR APPLICATIONS 1,054,404 10/1953 France 72) Primary Examiner-Richard J. Herbst Attorney-Fidelman, Wolffe & Leitner [5 7 ABSTRACT This invention relates to a method for shaping an indented steel wire characterized by comprising the steps of causing a coil shaped steel wire material to pass between working rolls consisting of a plurality of work rolls having convex portions immediately before applying said steel wire to a straightening machine to form it into a rectilinear shape thereby to shape a strip or several strips of rectilinear indentation around the outer periphery of the steel wire; then causing said steel wire to pass through a straightening machine thereby to automatically form one strip or several strips of spiral indentations; and cutting said wire material intoa predetermined dimension by means of a cutter; and further to a device therefor. I

8 Claims, 9 Drawing Figures PATENIEllJma I975 3,742,747

sum 1 or 2 FIG.| FIG.2

PATENTEU JUL 3 I975 SHEEI 2 0F 2 FIG.7 FIG.8

METHOD FOR SHAPING INDENTED STEEL WIRE AND APPARATUS THEREFOR SUMMARY OF THE INVENTION This invention relates to a method for shaping an indented steel wire, and more particularly to an indented steel wire suitable as a PC steel wire for concrete, and a device therefor.

The deformed steel wire in which concave or convex portions are provided around the outer periphery of PC steel wire for concrete to improve the tight adhesiveness with concrete portions has been well known. Nondirectional deformed steel wire in which in order to make the strength of each part of the steel wire uniform, the sectional area of each part is made quite the same despite the presence of deformation, has been put into practical uses.

In the present invention, an ordinary round coiled steel wire is used as a raw material in place of such specifically shaped steel wire, and in the step of making said round steel wire into a rectilinear shape by applying it to a straightening machine in the factory where it is used, and simultaneously deformation of steel wire is carried out by use of working rolls having convex portions around the periphery thereof thereby to be applied to the step of making ferro-reinforced baskets for concrete tubular bodies.

' The effects obtained by the present invention are set forth as follows:

I. It is inexpensive because ordinary round steel wire is used as a raw-material. 2. It is possible to use desired working rolls in the own factory and apply deformation to the material steel wire into a desired shape, and further it'is possible to easily subject the material steel wire to a low-temperature annealing process.

3. Since the deformation shaping step is added to the linear straightening step in the straightening machine, it is not necessary to provide any special device and any step for deformation shaping.

The other ofjects and the features of thepresent invention will be more apparent from a few examples embodying the present invention described in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a partial plane view showing one example of a steel wire shaped by the present invention;

FIG. 2 is a sectionalview taken along line II II of FIG. 1;

FIG. 3 is a front elevation, partly cut away, showing one example of the shaping device according to the present invention;

FIG. 4 is a side elevation showing one example of a working roll used in the present invention;

FIG. 5 is a side elevation showing other example embodying a working roll used in the present invention;

FIG. 6 is a front elevation, partly cut away, showing other example of the shaping device according to the present invention;

FIG. 7 is a side elevation showing further other example of a working roll'used in the present invention;

FIG. 8 is a side elevation showing still further other example ofa working roll used in the present invention;

and

FIG. 9 is a side elevation showing still further other example of a working roll according to the invention.

DETAILED DESCRIPTION OF THE INVENTION In FIGS. 1 and 2 respectively showing one example of a steel wire shaped in accordance with the invention, reference numeral 11 designates a product steel wire and, for example, indentations a having the pitch of,7 mm and depth of about 0.25 mm in two rows and in spiral shape having the cycle of 700 mm are provided in a steel wire having the outer diameter of 7 mm. When in the pitch of two rows of indentations a each half pitch is deviated, the strength of each part is equalized more, and more excellent non-directional property can be obtained.

FIG. -3 shows one example of a shaping device according to the present invention, in which: reference numeral 11 designates a raw material steel wire wound in a coil shape, one end thereof being drawn out and passed through a straightening machine and straightened rectilinearly, and thereafter it is cut in a predetermined dimension. Upon this occasion, when the delivery roll at the inlet side of straightening machine is replaced by working rolls l2, 12 having convex portions of tooth shape around the peripheries thereof as shown in F164, and said rolls are driven by suitably adjusting the pressure amount thereof, the tooth shape of the roll bites in the upper and lower surfaces of a steel wire 11 passing therethrough, and elliptical indentations a having a certain depth are carved at a predetermined pitch in two rows. Thereafter, while the steel wire entering subsequently the straightening machine is subjected repeatedly to bending by a suitable number of straightening dies l4 arranged in series in a straightening cylinder 15, and simultaneously the steel wire 11 is slightly twisted in the rotational direction in accordance with the rotation of the straightening cylinder 15, and advances by being drawn by a rearward feed roll 13. Accordingly, the rows of indentations a on the surface of the steel wire are twisted around the shaft of the steel wire and shaped in two rows in spiral form. The indented steel wire shaped in such manner is straightened rectilinearly and cut in a predetermined length by means of a cutter 16.

In this case, as shown in FIG. 5, assumed that only either upper roll or lower roll 12 of inlet side feed rolls of straightening machine be shaped in a working roll of tooth shaped convex portions and another ordinary feed grooved roll be designated by reference numeral 12', said indentations are formed on the surface of the steel wire as spiral strips of one aforementioned example.

According to the present invention apparent from the aforementioned examples, in the step of using the conventional straightening machine only working rolls having convex portions around the peripheries thereof a working roll having convex portions around the periphery thereof, the straightening machine being constituted by take-in guide rolls b a straightening rotary cylinder c, take-out guide rolls d, a cutter e, and straightening dies g. Reference character f denotes a transmission chain. When the material steel wire 11 of coil 11' passes through these devices, indentations are press carved on the upper and lower surfaces at a predetermined pitch in two rows and the steel wire advances while undergoing repeated bending by straightening dies g and further being imparted with slight twists in accordance with the rotation of rotary cylinder c. Accordingly, the steel wire which has been straightened rectilinearly by passing through these devices becomes an indented steel wire 11, the surface of which is formed with two rows of tooth shaped indentation strips formed in spiral shape.

FIG. 7 shows the construction of working rolls l2, and a lower working roll i driven from a transmission chain fthrough a sprocket h is interlocked with a upper work roll k through a gear mechanism j, and presses the steel wire 11 to shape the indentations a. I

FIG. 8 shows the case where the number of working rolls 12 is three (i, k1, k2) so that three strips of indentation a are shaped, and further,

FIG. 9 shows the case where the number of working rolls is four (1', kl, k2, k3) so that four strips of indentation are shaped. Thus, by the increase in the number of strip there occurs such a tendency that the directionality decreases and further adhesion with the concrete increases. Furthermore, in the working roll devices in each said example, it is possible to select only one roll having convex portions around the periphery thereof and make other rolls those smooth and flat press rolls thereby to shape a strip of indentaion a.

The effects obtained in said examples are similar to those described in the first example. The present invention has extremely high practicality when applied to the steel wire for PC pile and the like.

The present invention has been explained with reference to a few examples. It would be understood that in the present invention other examples are possible, and in size ratio and arrangement of each part, a number of modifications may be possible without departing from the spirit of the present invention as shown in the claim.

What We claim are l. A method for forming spiral indentations in and straightening wire comprising:

a. imparting at least one rectilinear row of spaced part indentations in said wire by passing said wire through at least two rollers,

b. simultaneously straightening said wire and imparting a twist thereto bypassing said wire through a plurality of straightening dies while simultaneously rotating said dies, and

c. cutting said wire.

2. The method of'claim 1 wherein there are two rollers, and each of said rollers provide a row of indentations.

3. The method of claim 1 wherein there are three rollers in contact with said wire, and each of said rollers provides a row of indentations.

4. The method of claim 1 wherein there are four rollers in contact with said wire, and each of said rollers provides a row of indentations in said wire.

5. An apparatus for forming spiral indentations in and straightening wire comprising:

a. spaced apart rectilinear indentation producing means including at least two rolls, at least one of which having a plurality of circumferentially arranged convex protrusions forming at least one row of indentations in said wire,

b. drive means driving said rolls whereby said wire is fed between said rolls, 0. simultaneous twisting and straightening means including a plurality of straightening dies aligned for serial passage of said wire therethrough and rotating means providing simultaneous rotation of said dies,

d. indented and straightened wire feed means, and

e. cutting means for said straightened and spirally indented wire.

6. The apparatus of claim 5 wherein said protrusions are positioned transverse two the direction of travel of said wire.

7. The apparatus of claim 5 wherein an additional feed means is provided between said indenting means, and said simultaneous means, said additional feed means being driven by said indenting means.

8. The apparatus of claim 5 wherein at least two of said rolls include said protrusions, and the contact points of said protrusions with said wire are spaced equally about the circumference of said wire. 

1. A method for forming spiral indentations in and straightening wire comprising: a. imparting at least one rectilinear row of spaced part indentations in said wire by passing said wire through at least two rollers, b. simultaneously straightening said wire and imparting a twist thereto bypassing said wire through a plurality of straightening dies while simultaneously rotating said dies, and c. cutting said wire.
 2. The method of claim 1 wherein there are two rollers, and each of said rollers provide a row of indentations.
 3. The method of claim 1 wherein there are three rollers in contact with said wire, and each of said rollers provides a row of indentations.
 4. The method of claim 1 wherein there are four rollers in contact with said wire, and each of said rollers provides a row of indentations in said wire.
 5. An apparatus for forming spiral indentations in and straightening wire comprising: a. spaced apart rectilinear indentation producing means including at least two rolls, at least one of which having a plurality of circumferentially arranged convex protrusions forming at least one row of indentations in said wire, b. drive means driving said rolls whereby said wire is fed between said rolls, c. simultaneous twisting and straightening means including a plurality of straightening dies aligned for serial passage of said wire therethrough and rotating means providing simultaneous rotation of said dies, d. indented and straightened wire feed means, and e. cutting means for said straightened and spirally indented wire.
 6. The apparatus of claim 5 wherein said protrusions are positioned transverse two the directioN of travel of said wire.
 7. The apparatus of claim 5 wherein an additional feed means is provided between said indenting means, and said simultaneous means, said additional feed means being driven by said indenting means.
 8. The apparatus of claim 5 wherein at least two of said rolls include said protrusions, and the contact points of said protrusions with said wire are spaced equally about the circumference of said wire. 